AMD Instinct MI308X vs NVIDIA GeForce RTX 4080 SUPER Comparison

The AMD Instinct MI308X and NVIDIA GeForce RTX 4080 SUPER occupy entirely different segments of the GPU market. The MI308X is a compute-oriented accelerator with a massive memory pool and raw throughput, while the RTX 4080 SUPER is a consumer graphics card with display outputs and a full API stack. The data shows that the RTX 4080 SUPER has an average benchmark score of 54,209, placing it in the 86th percentile of all GPUs, whereas the MI308X has no recorded benchmark scores and sits at the 50th percentile. The MI308X is designed for workloads like large-scale inference and memory-bound compute, where its 192 GB HBM3 and 5.32 TB/s bandwidth are decisive. The RTX 4080 SUPER is the only one of the two with a playable DirectX feature set, making it the sole option for gaming and conventional desktop graphics.

The Verdict

The data clearly indicates two divergent purposes. The AMD Instinct MI308X is an OAM module with no display outputs, no DirectX, OpenGL, or Vulkan support, and a 750 W thermal design power. It is not a consumer product. The NVIDIA GeForce RTX 4080 SUPER is a triple-slot PCIe card with 1x HDMI 2.1 and 3x DisplayPort 1.4a outputs, supporting DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. It is an end-of-life consumer graphics card with a 320 W TDP and a launch MSRP of 999 USD.

For anyone needing a functional graphics card for gaming, rendering, or desktop acceleration, the RTX 4080 SUPER is the only choice based on the recorded benchmarks. It delivers a 3DMark Steel Nomad DX12 score of 6,600, a Geekbench OpenCL score of 219,065, and a Geekbench Vulkan score of 260,075. The MI308X has zero benchmark entries, so no performance comparison can be made for standard graphics workloads.

For compute tasks that require massive memory capacity, the MI308X is the selection. Its 192 GB of HBM3 memory with an 8192-bit bus and 5.32 TB/s bandwidth vastly exceed the RTX 4080 SUPER's 16 GB GDDR6X with a 256-bit bus and 736.3 GB/s. The MI308X also has a higher FP32 throughput at 81.72 TFLOPS versus 52.22 TFLOPS for the RTX 4080 SUPER. The MI308X is a server accelerator for training and inference, not a desktop part.

FAQ

Q: Which GPU has more memory bandwidth?

A: The AMD Instinct MI308X has 5.32 TB/s of bandwidth, while the NVIDIA GeForce RTX 4080 SUPER has 736.3 GB/s. The MI308X also has a wider 8192-bit memory bus compared to the 256-bit bus on the RTX 4080 SUPER.

Q: Does the AMD Instinct MI308X support DirectX?

A: No. The database lists DirectX as N/A for the MI308X, along with OpenGL and Vulkan also being N/A. The RTX 4080 SUPER supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What is the transistor count difference?

A: The MI308X uses 153,000 million transistors on a 1017 mm² die, while the RTX 4080 SUPER uses 45,900 million transistors on a 379 mm² die. The MI308X has a higher transistor density of 150.4M per mm² versus 121.1M per mm² for the RTX 4080 SUPER.

Q: How do the clock speeds compare?

A: The MI308X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The RTX 4080 SUPER has a base clock of 2295 MHz and a boost clock of 2550 MHz, making it significantly higher in both cases.

Q: What are the power requirements?

A: The MI308X has a TDP of 750 W and requires a suggested power supply of 1150 W, with no power connectors listed because it uses an OAM module slot. The RTX 4080 SUPER has a TDP of 320 W, uses a 1x 16-pin connector, and requires a suggested power supply of 700 W.

Q: Does the MI308X have any display outputs?

A: No. The database records "No outputs" for the MI308X. The RTX 4080 SUPER provides 1x HDMI 2.1 and 3x DisplayPort 1.4a.

Architecture Differences

The two GPUs come from different architectural lineages. The AMD Instinct MI308X is built on CDNA 3.0, specifically designed for compute-centric workloads, while the NVIDIA GeForce RTX 4080 SUPER uses Ada Lovelace, which targets graphics and ray tracing. Both are manufactured on a 5 nm process at TSMC, but the die sizes diverge sharply: the MI308X measures 1017 mm², the RTX 4080 SUPER measures 379 mm². The MI308X integrates 153,000 million transistors, giving a density of 150.4M per mm², whereas the RTX 4080 SUPER integrates 45,900 million transistors at a density of 121.1M per mm².

The MI308X has 19,456 shading units, 1,216 texture mapping units, and zero ROPs, consistent with a compute accelerator that does not need raster output. Its pixel rate is 0 MPixel/s, and its texture rate is 2,553.6 GTexel/s. The RTX 4080 SUPER has 10,240 shading units, 320 TMUs, and 112 ROPs, with a pixel rate of 285.6 GPixel/s and a texture rate of 816.0 GTexel/s. The RTX 4080 SUPER also includes 80 ray tracing cores and 320 tensor cores, features absent from the MI308X's specification list.

Memory architecture is the most significant divergence. The MI308X uses HBM3 with a capacity of 192 GB, an 8192-bit bus, and a bandwidth of 5.32 TB/s. The RTX 4080 SUPER uses GDDR6X with 16 GB, a 256-bit bus, and 736.3 GB/s. The effective memory clock on the MI308X is 5.2 Gbps, while the RTX 4080 SUPER runs at 23 Gbps effective. The MI308X is also an OAM module, not a standard PCIe card, and has no display outputs. The RTX 4080 SUPER is a triple-slot card measuring 310 mm in length, 140 mm in height, and 61 mm in width, with a 16-pin power connector.

Specification Differences

The recorded differences between the two parts are extensive. The MI308X has a base clock of 1000 MHz and a boost clock of 2100 MHz, while the RTX 4080 SUPER operates at 2295 MHz base and 2550 MHz boost. Memory capacity is 192 GB versus 16 GB, memory type is HBM3 versus GDDR6X, and bus width is 8192 bit versus 256 bit. Bandwidth is 5.32 TB/s versus 736.3 GB/s.

Compute resources differ: shading units are 19,456 on the MI308X versus 10,240 on the RTX 4080 SUPER. TMUs are 1,216 versus 320, and ROPs are 0 versus 112. The MI308X has no ray tracing or tensor cores listed, whereas the RTX 4080 SUPER has 80 RT cores and 320 tensor cores. FP32 performance is 81.72 TFLOPS on the MI308X and 52.22 TFLOPS on the RTX 4080 SUPER. FP16 performance follows the same ratio at 81.72 TFLOPS (1:1) versus 52.22 TFLOPS (1:1).

Power and cooling are also distinct. The MI308X has a TDP of 750 W and a suggested PSU of 1150 W, with no power connectors and an OAM Module slot width. The RTX 4080 SUPER has a TDP of 320 W, a suggested PSU of 700 W, a 1x 16-pin connector, and a triple-slot width. The bus interface is PCIe 5.0 x16 for the MI308X and PCIe 4.0 x16 for the RTX 4080 SUPER. Display outputs are none on the MI308X versus 1x HDMI 2.1 and 3x DisplayPort 1.4a on the RTX 4080 SUPER. API support is entirely absent on the MI308X, while the RTX 4080 SUPER supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Head-to-Head Benchmarks

The head-to-head benchmark list in the database is empty, and the MI308X has no benchmark scores recorded. Therefore, direct numerical comparisons rely on the RTX 4080 SUPER's available scores and the MI308X's raw specifications. The RTX 4080 SUPER achieves a 3DMark Steel Nomad DX12 score of 6,600, a Geekbench OpenCL score of 219,065, and a Geekbench Vulkan score of 260,075. It also posts PassMark scores of 34,245 in G3D, 19,822 in GPU Compute, 1,270 in G2D, 381 in DirectX 9, 301 in DirectX 11, 193 in DirectX 10, and 134 in DirectX 12.

The MI308X cannot participate in these tests because it lacks the required graphics APIs. Its FP32 throughput of 81.72 TFLOPS exceeds the RTX 4080 SUPER's 52.22 TFLOPS by roughly 56 percent, but this raw compute advantage does not translate to any recorded benchmark result. The MI308X's texture rate of 2,553.6 GTexel/s is more than triple the 816.0 GTexel/s of the RTX 4080 SUPER, yet the MI308X has a pixel rate of 0 MPixel/s due to having no ROPs.

The RTX 4080 SUPER's nearest rivals in the database are the NVIDIA GeForce RTX 4080, which is 0.1 percent slower, the AMD Radeon Pro W5700X at 1.1 percent slower, the AMD Radeon RX 6750 GRE 12 GB at 2.7 percent slower, and the AMD Radeon 8060S at 2.8 percent slower. These deltas show that the RTX 4080 SUPER performs within a narrow band of similar consumer and workstation parts, but no such context exists for the MI308X.

Where Each One Wins

The AMD Instinct MI308X wins decisively in memory capacity and bandwidth. With 192 GB of HBM3 and 5.32 TB/s, it is suited for large models and datasets that exceed the 16 GB limit of the RTX 4080 SUPER. Its FP32 output of 81.72 TFLOPS and texture rate of 2,553.6 GTexel/s indicate higher raw compute throughput. The MI308X also has a larger die and more transistors, suggesting it is engineered for sustained compute workloads in server environments.

The NVIDIA GeForce RTX 4080 SUPER wins in every graphics-related category. It has display outputs, full API support, and a working rendering pipeline with 112 ROPs and a pixel rate of 285.6 GPixel/s. It also has ray tracing cores and tensor cores, enabling features that the MI308X does not offer. The RTX 4080 SUPER has a higher boost clock at 2550 MHz, a smaller footprint, and a lower power draw at 320 W. Its benchmark scores, including the 3DMark Steel Nomad result and Geekbench Vulkan score, confirm it operates in standard consumer workloads, while the MI308X does not appear in any benchmark database.

For a user with a desktop PC, the RTX 4080 SUPER is the functional choice. For a data center operator requiring massive memory and compute density, the MI308X is the designed part. The two do not compete; they serve separate ecosystems, and the data reflects that separation through the absence of shared benchmarks and the stark contrast in specifications.